Use this semiconductor calculation for first-order device, material, fabrication, interconnect, packaging, or reliability estimates when every coefficient and unit convention is known.

Open-circuit voltage (V)

Required number in V. Open-circuit voltage of the cell.

Temperature (K)

Optional number in K. Cell temperature used to calculate thermal voltage.

Ideality factor

Optional number. Diode ideality factor used to normalize open-circuit voltage.

The cited overview of Solar cell supplies background for the terminology and domain context used by this tool.^[1]

Estimate the ideal solar cell fill factor from its open-circuit voltage with the empirical logarithmic formula. Inputs are interpreted exactly in the displayed units and the calculation returns the following fields without presentation rounding.

Fill factor

Returned number. Estimated fill factor between 0 and 1.

• Material composition, geometry, process history, temperature, electric field, bias, interfaces, parasitics, and fitted parameter ranges can invalidate a compact semiconductor model.
• Use finite inputs in the displayed units, preserve source measurements and assumptions, and independently verify consequential decisions.

Compare the estimate with measured process data, current device documentation, and a higher-fidelity circuit, field, thermal, quantum, or TCAD model when the decision requires it.

• Solar Cell Efficiency Calculator

  Compute solar cell power conversion efficiency from short-circuit current density, open-circuit voltage, fill factor, and incident power density.

• Solar Cell Voc Calculator

  Compute the open-circuit voltage of a solar cell from its short-circuit and dark saturation current densities.

• Diode Ideality Factor Calculator

  Extract the diode ideality factor n from two forward-bias points on the exponential Shockley relation. Formula: n = (V2 - V1) / (Vt·ln(I2/I1)), where thermal voltage Vt = k·T/q (k=1.380649e-23 J/K, q=1.602176634e-19 C). Inputs: I1>0 mA, I2>0 mA and I1≠I2, V1 and V2 finite V, T>0 K (default 300 K). Output: n>0 (physical diode typically 1 ≤ n ≤ 2; n=1 ideal diffusion, n≈2 recombination/generation; n outside 1-2 indicates series resistance, high injection, or measurement error). Assumes forward exponential region, negligible series resistance, and constant temperature.